Web Traffic Research & Evidence-Based Practice 5

Question 1

A traffic analyst wants to compare the effectiveness of three different content strategies across 12 months. Which statistical test is most appropriate for this repeated-measures design?

Accepted Answer

Repeated-measures ANOVA with Greenhouse-Geisser correction

Answer

Repeated-measures ANOVA accounts for the within-subject correlation across time points, and the Greenhouse-Geisser correction addresses violations of the sphericity assumption.

Question 2

Which practice best ensures reproducibility when publishing a web traffic analysis based on Google Search Console data?

Accepted Answer

Sharing the raw exported CSV files and all analysis scripts publicly

Answer

Sharing raw data exports and analysis scripts enables other researchers to exactly replicate every step of the analysis, the gold standard for reproducibility.

Question 3

An analyst is building a causal model of paid search traffic using directed acyclic graphs (DAGs). What is the primary purpose of identifying collider variables in this context?

Accepted Answer

To avoid conditioning on variables that open non-causal backdoor paths

Answer

Conditioning on a collider variable in a DAG opens a spurious association between its parents, introducing bias into the causal estimate of paid traffic effects.

Question 4

A 12-month traffic dataset shows a strong upward trend for both newsletter subscribers and organic visits. Before concluding that subscribers drive organic traffic, which test should be applied?

Accepted Answer

Granger causality test after differencing to achieve stationarity

Answer

Granger causality tests whether past values of subscribers improve predictions of future organic visits beyond the visit series alone, after removing non-stationary trends.

Question 5

In evidence-based web optimization, which hierarchy of evidence should guide decisions about implementing a new site architecture?

Accepted Answer

Meta-analyses → systematic reviews → randomized experiments → observational studies → expert opinion

Answer

The standard evidence hierarchy places meta-analyses and systematic reviews at the top, followed by controlled experiments, then observational studies, and expert opinion at the bottom.

Web Traffic Practice Test

Web Traffic Practice Test

Web Traffic Research & Evidence-Based Practice 5